How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Robert Your Own Question

Robert
Robert, RV Mechanic
Category: RV
Satisfied Customers: 6920
Experience:  10 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
Type Your RV Question Here...
Robert is online now
A new question is answered every 9 seconds

I have a 400 hp cummins motor on my american coach..rv.

Customer Question

I have a 400 hp cummins motor on my american coach rv. what performance parts do you recommend where I can reach upwards of 500+ hp?
Submitted: 5 years ago.
Category: RV
Expert:  Robert replied 5 years ago.

Hi There!!!

 

Thanks for Choosing Just Answer...

 

Do you have a rear radiator or side mounted radiator?

 

Thanks. Robert

Customer: replied 5 years ago.
Side mounted radiator.
Customer: replied 5 years ago.
just some more info. the engine is a cummins ISL 8.9 Liter. I found something online called Dr. Performance predator performance module. Any opionons on this module?
Expert:  Robert replied 5 years ago.

OK

 

Here are my feelings on any upgrades. First off this is a brand new unit. You need to be very careful on anything you do to alter the horsepower. The reason being is you can void the warranty on your engine and any repairs would not be covered. Another issue I see is this is a 2009 and I would not want to experiment with after market products with the new emissions. I do know in some cases Cummins can upgrade the computer software to a higher Horse power. They do charge a hefty fee for doing this. What I would do at this point is get your 8 digit engine serial number and call Cummins directly to see if you can in fact increase the horsepower with a simple calibration. When you increase horse power other things components need to be factored in such as the turbo and the transmission converter. I would hate to see anything happen to this new unit. I asked about the radiator because on some of the rear radiators a two speed fan controller can be added that is approved by cummins, this can not be done on the side mounted radiator. Hope this helps, if you have any other concerns or comments please feel free to contact me.

 

Customer: replied 5 years ago.

Thanks Robert...

 

I will call Cummins tomorrow and see if they offer any calibrations to this motor. So just to confirm, you don't think the module is a good idea because of the emmisons issue?

I still can't understand why american coach would put a 400hp motor in a coach that weighs around 40,000 lbs. It has a hard time climbing hills with my tow vehicle attached.

Expert:  Robert replied 5 years ago.

I do not... I have seen items like banks systems installed and it creates a issue with cummins.. That is allot of weight for a ISL. You may be able to get 25 more horse power with a calibration. Cummins would charge a hefty fee because it prevents others from buying a smaller engine and upgrading.. Anything you do I would get it approved with cummins.. In 2008 new emission standards came out and I would really be concerned about how any after market product reacts or if any testing has been done. Hope this makes sense.

 

Customer: replied 5 years ago.
Yes, it makes sense. what does ISL stand for?
Expert:  Robert replied 5 years ago.

Here are the engine meanings.. so IS is Interact System and L is 9 liter engine models

 

Engine Series

IS = Interact System (i.e. ISX, ISB)
Q/QS = Signifies that an industrial engine is electronically controlled. QS stands for QUANTUM SYSTEM CONTROLS
B = B series engine line, includes 3.3 , 3.9, 4.5 and 5.9 liter engines. Offered in both fully mechanical and electronic models. 5.9 liter engine is available in both industrial and automotive versions.
C = C series engine line, includes only 8.3 liter engines. Offered in both fully mechanical and electronic models, industrial and automotive versions available.
E = On older engine models this meant the engine was electronic. EXAMPLE: K2000E
K = K series engine line, includes 19, 23, 38, 45, 50 and 60 liter engine models.
L = L series engine line, includes older 10 liter and current 9 liter engine models. Industrial and automotive versions available.
M = M series engine line, includes M11, 11liter engines only. Industrial and automotive versions available.
N = N series engine line, no longer being produced for U.S. market. Included NTA855 and N14 engine series. Industrial and automotive versions available.
T = T series engine line such as the QST30.
X = X series engine line, includes 15 liter engines only. Industrial and automotive versions available.

 

Thank You!! Please hit ACCEPT for my efforts, Positive feedback and BONUS welcomed!!!!

Robert, RV Mechanic
Category: RV
Satisfied Customers: 6920
Experience: 10 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
Robert and 5 other RV Specialists are ready to help you
Customer: replied 5 years ago.
Thanks for all your help Robert. Again I will contact Cummins tomorrow and hopefully they can help me further with some hp gains. Take Care

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Highly recommend this RV expert. Prompt, good and detailed answers were given. Very willing to help with genuine concern. I will ask for him next time. Jack USA
< Last | Next >
  • Highly recommend this RV expert. Prompt, good and detailed answers were given. Very willing to help with genuine concern. I will ask for him next time. Jack USA
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
 
 
 

Meet The Experts:

 
 
 
  • gene's Avatar

    gene

    RV Mechanic

    Satisfied Customers:

    1100
    28 yrs exp in the industry
< Last | Next >
  • http://ww2.justanswer.com/uploads/barcoded06/2009-06-08_030842_gene.jpg gene's Avatar

    gene

    RV Mechanic

    Satisfied Customers:

    1100
    28 yrs exp in the industry
  • http://ww2.justanswer.com/uploads/unclebobsuncle/2009-02-19_010056_jaubu.jpg Nick's Avatar

    Nick

    RVIA Certification

    Satisfied Customers:

    655
    5 years RV repair and reconstruction, Fleetwood RV Training course completion.
  • http://ww2.justanswer.com/uploads/PR/PrimoTenora/2012-7-31_03315_Disneycool.64x64.JPG Steve F.'s Avatar

    Steve F.

    RVIA Certification

    Satisfied Customers:

    441
    Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant
  • http://ww2.justanswer.com/uploads/rjgibbons408/2009-08-15_002559_scan001001.jpg Randall's Avatar

    Randall

    RVIA Certification

    Satisfied Customers:

    8162
    RVDA/RVIA Master Certified Technician with many years experience.
  • http://ww2.justanswer.com/uploads/gmplus72/2008-12-9_2615_just_answer.jpg Robert's Avatar

    Robert

    RV Mechanic

    Satisfied Customers:

    5678
    10 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
  • http://ww2.justanswer.com/uploads/Guest/2008-01-30_172341_image0.jpg RIP ROBERT's Avatar

    RIP ROBERT

    R.V. TECH & MECHANIC

    Satisfied Customers:

    401
    35 plus years HANDS ON WORK TROUBLE SHOOTING & REPAIRS
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    RV Mechanic

    Satisfied Customers:

    263
    16 years of experience